A person who prefers to be alone rather than with others. Different from a hermit, a lonewolf will live and work in society rather than hide from it. Can also refer to a person prefers to work alone. They differ from most in that they do not seek out the company of others.

That man leaning against the bar all by himself...he's a lonewolf bounty hunter...don't mess with him.

An individual that prefers to do things by their self. They work best alone. An individual who doesn’t care for having cooperation from another individual. He or she that finds it easier to take care of themselves without any social interaction. A person that lives for a goal in life. A commando that gets the job done without looking at anyone for help. An elite hero that performs the impossible by themself for no reason but of their own. A one man army.

Solid Snake from Metal Gear Solid and Duke Nukem is a good example of a lonewolf.

"Why don't you bring someone with you?" She said. "I prefer to do things my way." He says as he puts on his glasses.
"You're a true lonewolf." She replied.

A "Lone Wolf" is someone who keeps to themself, and tends to sit around older kids looking awkward. Although this person may look awkward, DON'T BE FOOLED! This Lone Wolf may be actually pretty cool. They might end up being grouped with the younger kids at larger family functions; generally the "Lone Wolf" is a billion times more mature and less weird than kids their age, however too awkward to hang out with people who are older, henceforth the moniker "Lone Wolf."

Macy: "Look at this kid. She is so awkward!"
Hazel: "Nah, man, that is a Lone Wolf!"